frontend/public/style.css

/**
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

.image-border {
    border-width: 15px;
    border-style: solid;
    padding: 5px;
    padding-bottom: 0px;
}

#picture-grid {
    display: flex;
    flex-wrap: wrap;
}

#picture-grid > * {
    margin: 5px;
    flex: 1 1 450px;
    max-width: 320px;
}